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update the calculation and orthogonalization for bitangent

pull/4397/head
youkeyao 2022-02-20 17:10:20 +08:00
parent dff3620138
commit ad766cb738
1 changed files with 4 additions and 4 deletions
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8
code/PostProcessing/CalcTangentsProcess.cpp
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@ -191,9 +191,9 @@ bool CalcTangentsProcess::ProcessMesh(aiMesh *pMesh, unsigned int meshIndex) {
tangent.x = (w.x * sy - v.x * ty) * dirCorrection; tangent.x = (w.x * sy - v.x * ty) * dirCorrection;
tangent.y = (w.y * sy - v.y * ty) * dirCorrection; tangent.y = (w.y * sy - v.y * ty) * dirCorrection;
tangent.z = (w.z * sy - v.z * ty) * dirCorrection; tangent.z = (w.z * sy - v.z * ty) * dirCorrection;
bitangent.x = (w.x * sx - v.x * tx) * dirCorrection; bitangent.x = (- w.x * sx + v.x * tx) * dirCorrection;
bitangent.y = (w.y * sx - v.y * tx) * dirCorrection; bitangent.y = (- w.y * sx + v.y * tx) * dirCorrection;
bitangent.z = (w.z * sx - v.z * tx) * dirCorrection; bitangent.z = (- w.z * sx + v.z * tx) * dirCorrection;
// store for every vertex of that face // store for every vertex of that face
for (unsigned int b = 0; b < face.mNumIndices; ++b) { for (unsigned int b = 0; b < face.mNumIndices; ++b) {
@ -201,7 +201,7 @@ bool CalcTangentsProcess::ProcessMesh(aiMesh *pMesh, unsigned int meshIndex) {
// project tangent and bitangent into the plane formed by the vertex' normal // project tangent and bitangent into the plane formed by the vertex' normal
aiVector3D localTangent = tangent - meshNorm[p] * (tangent * meshNorm[p]); aiVector3D localTangent = tangent - meshNorm[p] * (tangent * meshNorm[p]);
aiVector3D localBitangent = bitangent - meshNorm[p] * (bitangent * meshNorm[p]); aiVector3D localBitangent = bitangent - meshNorm[p] * (bitangent * meshNorm[p]) - localTangent * (bitangent * localTangent);
localTangent.NormalizeSafe(); localTangent.NormalizeSafe();
localBitangent.NormalizeSafe(); localBitangent.NormalizeSafe();